Replacement of fluoroscopy by ultrasonography in the evaluation of hemidiaphragm function, an exploratory prospective study

The Ultrasound Journal

Table 3 Linear coefficient and Pearson correlation coefficient of each hemidiaphragm motion measured by fluoroscopy, area change, resting (end expiratory) thickness and thickening fraction compared to spirometry results

Both hemidiaphragms	Lateral views	Linear regression						Pearson correlation coefficient
Both hemidiaphragms	Lateral views	Coef.	Std.	t	p-value	95% CI		Pearson correlation coefficient
FEV1
Left hemidiaphragm	Fluoroscopy	0.28	0.07	3.76	0.001	0.13	0.43	0.7369
Left hemidiaphragm	Ultrasonography	0.04	0.01	2.81	0.01	0.01	0.07	0.5285
Right hemidiaphragm	Fluoroscopy	0.20	0.07	2.64	0.01	0.04	0.35	0.4575
Right hemidiaphragm	Ultrasonography	0.02	0.01	2.73	0.01	0.01	0.04	0.4598
FVC
Left hemidiaphragm	Fluoroscopy	0.31	0.08	3.86	0.001	0.15	0.48	0.7332
Left hemidiaphragm	Ultrasonography	0.05	0.01	4.13	0.001	0.03	0.08	0.6913
Right hemidiaphragm	Fluoroscopy	0.19	0.08	2.27	0.03	0.02	0.36	0.3992
Right hemidiaphragm	Ultrasonography	0.02	0.01	2.75	0.01	0.01	0.04	0.4731
FEV1
Left hemidiaphragm	Resting thickness	− 6.75	3.78	− 1.79	0.09	− 14.5	1.03	− 0.34
Left hemidiaphragm	Thickening fraction	− 0.96	1.08	− 0.89	0.38	− 3.17	1.26	− 0.17
Right hemidiaphragm	Resting thickness	− 0.63	2.77	− 0.23	0.82	− 6.31	5.05	0.01
Right hemidiaphragm	Thickening fraction	0.04	0.77	0.05	0.96	− 1.54	1.62	− 0.0428
FEV
Left hemidiaphragm	Resting thickness	− 6.01	4.31	− 1.40	0.18	− 14.9	2.86	− 0.2796
Left hemidiaphragm	Thickening fraction	− 0.30	1.22	− 0.24	0.81	− 2.80	2.21	− 0.0552
Right hemidiaphragm	Resting thickness	− 1.41	3.02	− 0.47	0.64	− 7.60	4.78	− 0.0715
Right hemidiaphragm	Thickening fraction	− 0.32	0.84	− 0.38	0.71	− 2.04	1.41	− 0.0507

CI Confidence interval, FEV1 Forced expiratory volume in 1 s, FVC Forced vital capacity, Std. Standard deviation